build: lint .eslintrc.js file

Update default files to be linted with ESLint to include .eslintrc.js.

PR-URL: https://github.com/nodejs/node/pull/19122


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>